"BASIZE" is a relatively uncommon word, but there are several synonyms that can be more widely used. One such synonym is "ensure", which means to make certain or guarantee. Another synonym is "establish", which refers to the act of setting up or building something. Additionally, "arrange" can be used as a synonym for "basize" in terms of organizing or planning something. "Secure", meaning to obtain or obtain possession of something, can also be considered a synonym. Lastly, "safeguard" can be used in reference to protecting or securing something. While "basize" might not be a commonly used term, these synonyms can help convey its meaning in a more familiar manner.